<template>
  <div>
     <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false" show-icon></el-alert>
      <!-- 选择商品分类的区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <!-- options:指定级联表单的数据源 -->
          <el-cascader v-model="selectdCateKeys" :options="cateList"
                      :props="cateProps"
                      @change="handleChange">
          </el-cascader>
        </el-col>
      </el-row>
      <!-- 页签区 -->
      <!-- name为activeName可指定的默认数据 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="用户管理" name="many">动态参数
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" 
                    @click="addDialogVisible=true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i"
                        closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!-- 输入文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                          v-model="scope.row.inputValue" ref="saveTagInput"
                          size="small" @keyup.enter.native="handleInputConfirm(scope.row)"
                          @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small"
                            @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit"
                            @click="showEditDiglog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete"
                            @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="配置管理" name="only">静态属性
          <el-button type="primary" size="mini" :disabled="isBtnDisabled"
                      @click="addDialogVisible=true">添加属性</el-button>
           <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
           <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i"
                        closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!-- 输入文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible"
                          v-model="scope.row.inputValue" ref="saveTagInput"
                          size="small" @keyup.enter.native="handleInputConfirm(scope.row)"
                          @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加的按钮 -->
                <el-button v-else class="button-new-tag" size="small"
                            @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit"
                             @click="showEditDiglog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete"
                            @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible"
                width="50%" @close="addDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" 
                label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible"
                width="50%" @close="editDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" 
                label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {  
    name: "Params",
    data() {
      return {
        cateList: [], //商品分类的数据列表
        cateProps: { //级联选择框的配置对象
          expandTrigger: 'hover',
          value: 'cat_id', //真正选中的值
          label: 'cat_name', //用户所看到的值
          children: 'children', //
        },
        selectdCateKeys: [], //级联选择框双向绑定到的数据
        activeName: 'many', //被激活的页签的名称，默认为“用户管理”
        manyTableData: [], //动态参数的数据
        onlyTableData: [], //静态属性的数据
        addDialogVisible: false, //控制添加对话框的显示与隐藏
        addForm: {
          // attr_name: '',
        }, //添加参数的表单数据对象
        addFormRules: { //添加表单的验证规则对象
          attr_name: [
             { required:true, message:'请输入参数名称', trigger:'blur' },
          ],
        },
        editDialogVisible: false, //控制修改对话框的显示与隐藏
        editForm: { //修改的表单数据对象
          attr_name: '',
        },
        editFormRules: { //修改表达的验证规则对象
          attr_name: [
             { required:true, message:'请输入参数名称', trigger:'blur' },
          ],
        },
      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      //获取所有的商品分类列表
      async getCateList() {
        const {data:res} = await this.$http.get('categories')
        if(res.meta.status != 200) {
          return this.$message.error('获取商品分类失败！')
        }
        this.cateList = res.data
        // console.log(this.cateList);
      },
      //级联选择框选中项变化，会触发这个
      handleChange() {
        this.getParamsData()
      },
      //Tab页签点击事件的处理函数
      handleTabClick() {
        // console.log(this.activeName);
        this.getParamsData()
      },
      //获取参数的列表
      async getParamsData() {
        // console.log(this.selectdCateKeys);
        if(this.selectdCateKeys.length != 3) { //证明选中的不是三级分类
          this.selectdCateKeys = [] //不是三级选项的话，就清空数组
          this.manyTableData = []
          this.onlyTableData = []
          return
        } 
        //证明选中的是三级分类
        // console.log(this.selectdCateKeys);
        //根据所选分类的Id和当前所处的面板，获取对应的参数
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: {sel: this.activeName}
        })
        if(res.meta.status != 200) {
          return this.$message.error('获取参数列表失败！')
        }

        res.data.forEach(item => {
          //先判断这个拼接的数组是否为空，为空的话，就返回一个空数组，不为空再赋值
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
          //添加一个布尔值，来控制文本框的显示与隐藏
          item.inputVisible = false
          item.inputValue = ''
        })
        console.log(res.data);
        if(this.activeName == 'many') {
          this.manyTableData = res.data
        } else {
          this.onlyTableData = res.data
        }
      },
      //监听添加对话框的关闭事件
      addDialogClosed() {
        this.$refs.addFormRef.resetFields()
      },
      //点击按钮添加参数
      addParams() {
        this.$refs.addFormRef.validate( async valid => {
          if(!valid) return
          const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`, {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName, //当前激活的是哪个标签页
          })
          if(res.meta.status != 201) {
            return this.$message.error('添加参数失败！')
          }
          this.$message.success('添加参数成功！')
          this.addDialogVisible = false
          this.getParamsData() //刷新数据列表
        })
      },
      //点击按钮 展示修改对话框
      async showEditDiglog(attr_id) {
        //查询当前参数的信息
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
          params: {attr_sel: this.activeName}
        })
        if(res.meta.status != 200) {
          return this.$message.error('获取信息失败！')
        }
        this.editForm = res.data

        this.editDialogVisible = true
      },
      //重置修改的表单
      editDialogClosed() {
        this.$refs.editFormRef.resetFields()
      },
      //点击按钮修改参数信息
      editParams() {
        this.$refs.editFormRef.validate(async valid => {
          if(!valid) return
          const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
            attr_name: this.editForm.attr_name, attr_sel:this.activeName
          })
          if(res.meta.status != 200) {
            return this.$message.error('修改参数失败！')
          }
          this.$message.success('修改参数成功！')
          this.getParamsData()
          this.editDialogVisible = false
        })
      },
      //根据id删除对应的参数项
      async removeParams(attr_id) {
        const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)

        //用户取消了删除的操作
        if(confirmResult != 'confirm') {
          return this.$message.info('已取消删除')
        }
        //删除的逻辑
        const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if(res.meta.status != 200) {
          return this.$message.error('删除参数失败！')
        }
        this.$message.success('删除参数成功！')
        this.getParamsData()
      },
      //文本框失去焦点 或 按下enter键都会触发
      handleInputConfirm(row) {
        if(row.inputValue.trim().length == 0) {
          row.inputValue = ''
          row.inputVisible = false
          return
        }
        //如果没有return，则证明输入的内容合法，需要做后续处理
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false

        //需要发起请求，保存这次数据
        this.saveAttrVals(row)
      },
      //将对attr_value的操作保存到数据库
      async saveAttrVals(row) {
        //需要发起请求，保存这次数据
        const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' '),
        })

        if(res.meta.status != 200) {
          return this.$message.error('修改参数项失败！')
        }
        this.$message.success('修改参数项失败！')
      },
      //点击按钮展示文本输入框
      showInput(row) {
        row.inputVisible = true
        //点击文本框，自动获取焦点
        //$nextTick当页面上的元素被重新渲染之后，才会指定回调函数中的代码
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
      },
      //删除对应的参数和选项
      handleClose(i, row) {
        row.attr_vals.splice(i, 1)
        this.saveAttrVals(row)
      }
    },
    computed: {
      //如果按钮需要被禁用则返回true，否则返回true
      isBtnDisabled() {
        if(this.selectdCateKeys.length != 3) {
          return true
        }
        return false
      },
      //当前选中的三级分类的id
      cateId() {
        if(this.selectdCateKeys.length == 3) {
          return this.selectdCateKeys[2]
        }
        return null
      },
      //动态计算标题的文本
      titleText() {
        if(this.activeName == 'many') {
          return '动态参数'
        }
        return '静态属性'
      },
    }
  }
</script>

<style lang="less" scope>
  .cat_opt {
    margin: 15px 0;
  }
  .el-cascader {
    width: 150px;
  }
  .el-tag {
    margin: 10px;
  }
  .el-input--small .el-input__inner {
    width: 120px;
  }
</style>